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6 * modification, are permitted provided that the following conditions
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29 * @(#)ttyname.c 8.2 (Berkeley) 1/27/94
30 * $FreeBSD: src/lib/libc/gen/ttyname.c,v 1.24 2007/01/09 00:27:55 imp Exp $
31 * $DragonFly: src/lib/libc/gen/ttyname.c,v 1.14 2005/11/19 22:32:53 swildner Exp $
34 #include "namespace.h"
35 #include <sys/types.h>
45 #include "reentrant.h"
46 #include "un-namespace.h"
48 #include "libc_private.h"
50 static char ttyname_buf
[sizeof(_PATH_DEV
) + NAME_MAX
];
52 static once_t ttyname_init_once
= ONCE_INITIALIZER
;
53 static thread_key_t ttyname_key
;
54 static int ttyname_keycreated
= 0;
57 ttyname_r(int fd
, char *buf
, size_t len
)
64 /* Must be a terminal. */
67 /* Must be a character device. */
68 if (_fstat(fd
, &sb
) || !S_ISCHR(sb
.st_mode
))
70 /* Must have enough room */
71 if (len
<= sizeof(_PATH_DEV
))
74 strcpy(buf
, _PATH_DEV
);
76 devname_r(sb
.st_rdev
, S_IFCHR
, buf
+ used
, len
- used
);
81 ttyname_keycreate(void)
83 ttyname_keycreated
= (thr_keycreate(&ttyname_key
, free
) == 0);
94 if (thr_once(&ttyname_init_once
, ttyname_keycreate
) != 0 ||
97 if ((buf
= thr_getspecific(ttyname_key
)) == NULL
) {
98 if ((buf
= malloc(sizeof ttyname_buf
)) == NULL
)
100 if (thr_setspecific(ttyname_key
, buf
) != 0) {
107 if (ttyname_r(fd
, buf
, sizeof ttyname_buf
) != 0)